Question

1. Scientists believe that ancient ancestors of all animals were (1 point)
*single-celled prokaryotes that reproduced asexually.
*single-celled eukaryotes that sometimes grew in colonies.
*multicellular organisms that were probably autotrophic.
*multicellular organisms with an alternation of generations lifecycle.

2. The Cambrian Explosion resulted in the evolution of the first (1 point)
*dinosaurs and mammals.
*representatives of most animal phyla.
*bacteria.
*land animals.

3. Which of the following occurred before the Cambrian Explosion? (1 point)
*Animals acquired sp

Answer 1

2. Land animals....